Timberframeguy

Thank you for your reply. Building inspector is due round on Friday so I’m sure they will also have something useful to add.

We didn’t, this wasn’t requested.

Thank you for your reply, the total depth is 900 with a 670 depth strip. 1800! Wow

Hello there - I’ve had the attached design from our SE for a garage conversion with a second storey above. My builder has said the footing depth of 670 is ‘ridiculous’ and I should look to have this redesigned as it’s complete over kill. Can anyone shed any light on this? Thanks Normal ground, no trees nearby.

Thank you, if you are able could you clear up a couple of additional queries: - Can I dig a soil pipe channel through the existing garage floor then make good and screed as you've outlined above? - For an extension to the rear of the garage would BC be happy with insulating over a newly poured slab to match the level in the garage conversion and carry the floating floor across the entire area? The new floor would of course require more insulation to meet the u value for new elements (0.18). Much appreciated!

What did the BCO have to say?

Thank you for your reply. I take your point, it's a 'cost now' versus future energy savings versus (in the case of cavities) a loss of internal area. A 100 cavity using a 32 type cavity batt is coming in at 0.24 which I'm leaning quite heavily towards as it's saves on floor area in what is already a reasonably narrow garage and does not interfere with the garage door opening (a 150 cavity will). This brings me back round to my initial conundrum; the floor. I've established the concrete slab can remain intact with a floating floor meeting a u-value of 0.25. Does anyone who's read this far have any insight into how to overcome the fall in slab when building directly off it? Mine falls by around 100mm over the length - scribing or packing I suppose, at first thought although this would introduce a floor cavity below the insulation. Thanks again.

Constructing a full fill 150 cavity off the existing single skin brick work. There is the requirement to allow for a future second storey above. I’m hoping we can now go to a 100 cavity and deal with the u value requirements above in the future. Would there really be a noticeable difference for the occupants (us!) by getting down to 0.18?

Sorry I see now that image below your post was the regs I require, I’ll have a delve into them when I can. At first glance it would be this table for a garage conversion? This has some pretty huge implications for my build as the current architect design is to meet 0.18 in the walls and floor.

Thank you for this information, that is absolutely huge news for my project. Please could you link me to the specific regs on this? Thank you!

Good evening, I'm about to embark on a garage conversion with a small extension to the rear of the garage to match an existing rear single storey extension across the back of my house. My current conundrum is around the garage floor and meeting the required U values for BC, the garage has an existing concrete slab floor which falls to the front of the property by around 100mm over the 8m. To meet a u value of 0.18 kingspan advise a DPM then a 90mm PIR with a T&G floating floor. This would give a total thickness of around 108mm above the slab, unfortunately the step down into the garage from the kitchen is only 90mm and there's even less at the very back of the garage (~70mm). I really would like to avoid digging up the whole slab if possible, any insights would be much appreciated. Thanks

This is what i'm concerned about, perhaps UFH without the concrete floor is solely for gas boilers which can run at a higher temp? Yes I am planning to insulate between the joists while the house is a building site.

I am currently in the process of a designing my extension and am looking at ASHP with the associated grants as we tearing the house apart anyway so may as well use the opportunity to upgrade the CH. My question is would underfloor heating with the pre routed weyroc boards be viable with an ASHP or do you really need a solid concrete floor to achieve the required heating through under floor? Thanks!

Hi all, I have an existing brick & block single storey rear extension which I am looking to take down to the DPC level and re-do in a timber frame/timber clad construction using 150 timbers. Can anyone help me with the detail on fixing a 150 timber sole plate down onto the existing brick/block work above the DPC? The total width of the existing wall is 240mm including a 60mm cavity. Thanks!